Automatically trigger Always-Translate in new translation infobar

chrome/browser/ui/android/infobars/translate_compact_infobar.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_ANDROID_INFOBARS_TRANSLATE_COMPACT_INFOBAR_H_
 #define CHROME_BROWSER_UI_ANDROID_INFOBARS_TRANSLATE_COMPACT_INFOBAR_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
@@ skipping 18 matching lines @@
       const base::android::JavaParamRef<jobject>& obj,
       int option,
       const base::android::JavaParamRef<jstring>& value);
 
   // JNI method specific to boolean settings in translate.
   void ApplyBoolTranslateOption(JNIEnv* env,
                                 const base::android::JavaParamRef<jobject>& obj,
                                 int option,
                                 jboolean value);
 
+  // Check whether we should automatically trigger "Always Translate"
+  bool ShouldAutoAlwaysTranslate();
+
   // ContentTranslateDriver::Observer implementation.
   void OnPageTranslated(const std::string& original_lang,
                         const std::string& translated_lang,
                         translate::TranslateErrors::Type error_type) override;
 
  private:
   // InfoBarAndroid:
   base::android::ScopedJavaLocalRef<jobject> CreateRenderInfoBar(
       JNIEnv* env) override;
   void ProcessButton(int action) override;
   void SetJavaInfoBar(
       const base::android::JavaRef<jobject>& java_info_bar) override;
 
   translate::TranslateInfoBarDelegate* GetDelegate();
   translate::ContentTranslateDriver* translate_driver_;
 
+  // If number of consecutive translations is equal to this number, infobar will
+  // automatically trigger "Always Translate"
+  const int kAcceptCountThreshold = 5;
+
   DISALLOW_COPY_AND_ASSIGN(TranslateCompactInfoBar);
 };
 
 // Registers the native methods through JNI.
 bool RegisterTranslateCompactInfoBar(JNIEnv* env);
 
 #endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_TRANSLATE_COMPACT_INFOBAR_H_